2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 81Get this manual
MAINTENANCE Install the oil filter with the "OUT-SIDE" mark facing out
Installing the oil filter backwards will result in severe engine damage
Coat new O-ring with oil and install it into the oil filter cover grooveInstall the oil filter cover and tighten the two bolts securely
Fill the crankcase with the recommended engine oil (page 4-14)'04'05:
ENGINE OIL CAPACITY: 0.82 liter (0.87 US qt, 0.72 Imp qt) after draining filter change ENGINE OIL CAPACITY: 0.69 liter (0.73 US qt, 0.61 Imp qt) after draining filter change Make sure that the O-ring on the engine oil filler cap is in good condition and replace it with new one if necessaryReinstall the engine oil filler capStart the engine and let it idle for few minutesMake sure there are no oil leaksStop the engine and check the oil level (page 4-14)